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[JavaScript] 直感的に配列を結合する

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概要

今までconcat()を利用して配列の結合を行っていたのですが、
スプレッド演算子を利用することでよりわかりやすく書けることを知ったのでメモします。

実装

スプレッド演算子を使わない場合

.js
let array1 = [1,2,3];
let array2 = [4,5,6];
let array3 = array1.concat(array2);
console.log(array3);

//結果:[1,2,3,4,5,6]

スプレッド演算子の場合

.js
let array1 = [1,2,3];
let array2 = [4,5,6];
let array3 = [...array1, ...array2];
console.log(array3);

//結果:[1,2,3,4,5,6]
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